CSS,JS,PHP modified settings only work after i’ve install a caching plugin

Ok, you’ll need to go step-by-step through each one’s full uninstall instructions.

Deleting just the plugin’s files is never enough for deleting a caching plugin.

Instructions on fully deleting WP Super Cache are under https://ww.wp.xz.cn/plugins/wp-super-cache/ but I find https://www.nethostingtalk.com/viewtopic.php?t=279 to be a bit clearer.

For WP Fastest Cache https://www.nethostingtalk.com/viewtopic.php?t=288

For W3 Total Cache, see “How To Uninstall W3 Total Cache WordPress Plugin” under https://wp-rocket.me/faq/w3-total-cache-fixes/

For AutoOptimize https://ww.wp.xz.cn/support/topic/deleting-autoptimize-cache/